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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d7192d1415dcd71ec50d84e05f8f97d27ad63dd8cf26eb0f627e9e27e8a87c' 
  AND token = 'mW5qlcFEqj+UEqqpA1qaMztxXDvymg3pI5/WBkR2buM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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