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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e52cd8676e5d69213c8efc9d66008be3c3a16bff5483c5846c4f56d6add731' 
  AND token = 'zSCzekpctUQRSOqJJ3daQgLIFOzFOMXPAulBvT7nvsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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