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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f73b7d59fb7dcc1c3058c4d7616ad94e4d1b3b536f371f9c8fc4b1d8a1b0fc1' 
  AND token = 'A9S2H/Y1EvZFKwmHYpVx9TJgAY3vaEaZN8k+MklW41w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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