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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09fe9ac8b2e8b785a229a9d346db952ea7c4b1b00fe1a1873fd820273a82d2d' 
  AND token = 'nairA+8cDYRMFXoPqvpJtaYgxVha2cn6WlV8nmpLQ8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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