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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8db43aa6800ef20305b0c4c0a29faa851a44fc05ac0028d00436ccd9f7c785a' 
  AND token = 'dovt+Iej2bsp0K6R928dyDSqoH8H0BiSFrbkLxIcWAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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