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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5ab30e36b200fad96c80a9aed4bd7ffe48c4aca1e3540db253b0e91b115675' 
  AND token = 'gmat70+poufpZRiWM+Iw6p34QFkrSepkIwF9y2wdTg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00216

JSON explain

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