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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca7ca54dceac2494855f3966b4461a49455d24c0b5265e3721e0dc66c4d7b59' 
  AND token = 'eCT7zLYfChaKeCdGG6Ag7enNBk60aZO5uzdd/LOA0E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}