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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbfc9106dce7fdc8126a9c6e11c7600505abdaa1c9a9e067a0fc4a52f728ca42' 
  AND token = 'JP7bJuYCChlmRPlFRUNHJYxfg5i0fXcBiEQJ1FC1nJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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