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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5faf71da9b8ba2309e41fe48ac9579e28844d810b3c6cf45ed94c75e3380b722' 
  AND token = 'v59scmTjgbBanxxc8lI324ZA+X05qA9slEp9kNw27p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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