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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c330ec614da96bc0f8911f70dc38158bbcd1d0bb5936bfb5a1d4132f3bd3dd9' 
  AND token = 'OTinzfDnscCHR3umuysNfDcKDHeiNkM0yPUiEmqlLM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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