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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ec5ce7b13f6fd32a2b3e0b3c788859ba0d13eac2f15309096e25bfd23ca54f' 
  AND token = 'VihuWhUdEjWDO3sm8u0YNY5joBFYeK4dZrbZujSDmxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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