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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1b403ddeaae2261d690a3af889748af719b7a27da6b838e999f096a688322b' 
  AND token = 'RJDaKlBhMXv5s8gXW671t2UkCcoRbjDtBk3LAl/R0rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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