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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a56c197830cb1eb40daffcb6ad15b717db47cf0d43b383bd4e3e1328f32d3259' 
  AND token = 'q4gQPbhy1NsJQTn5URe1yb6YpsPeO30eK8kST11SZbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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