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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b04004f5a03c491ea37515130edfafebe371f17b40d9daa2ec5ef0c283b453d' 
  AND token = 'cQ5YNPCLYSuY6UKL13ttzluH8WbevRQ8ozL9a2dqJHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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