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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fbcd95c5ddbc2fad3cb7109842ed9deb035237af9b4430e1b1a51e73b6a889a' 
  AND token = 'fGxeUq9dyxvKFnH34i6C+qC7L+VsfuhurhlgFIIUv28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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