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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89d8e6892a9e58185f583b1c6f5f22ab797a8b8ba5e189e8270fd2045a0fda0' 
  AND token = 'Pm3PFpyWk7Hss8J21CR/jZeycq3OHkDUTsaOJH/+HiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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