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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '044771adb082d970dacc39d2feadfba55afe3064bce333cedece54601f7b1af3' 
  AND token = 'sNxL2w3iIzXSeQiiGoFF1Q5+uQo8OAxLiC7FzsTrl9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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