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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ccf9f0b6ecf56ae0e8aef7524a5ab4e6323c84d9228ca4b76db6a13acd0306d' 
  AND token = 'uZrYZneQapxK4vagbm7jSbTpaNxg55Jn2OdAenbbv5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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