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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc29132e7b2b4ce92aee0f9a20e9250c1bb7869746c790b079115da8d5a8c614' 
  AND token = 'wrLu2L6AkFRJnxKzIJYG7U5PMsU5o3TD192TNYfHdf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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