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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2def588b3f414b7e7f1b4f764329079301c03a2a1e00734568febaa51f936be1' 
  AND token = 'Gw7Yk39Bih7oq5WRoogJM8XthssR3gyzkob5zAQWubM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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