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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98194c03adc9f0ee1668d289559bfe61cf2b7735bc44ab72ce5080325393b2bd' 
  AND token = 'AeIJzjeeT5ISwmpknEui91cy8o5wGiK0Rk0cEv0zdVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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