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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d48b3d7b7d6e69ddb3394c4839cdf9415e73d9153d998d63f5ca7a81a97a02' 
  AND token = 'q9p4qvpr3nrho2ECpxgDrPbMFAiPsP9qj1rORO5BD3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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