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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a18a0e2393c0d9a3ff9f10c63a916df236d7a54d49e830b2dae6b4b4591c54b' 
  AND token = 'zAIyuqyP4j7MxghybgAZSPMN7MRWSpkbgKJ/ZAGquEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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