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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9170837af273ccd62a6c2a98e85e1806d1adc9a6a309a291bd4a1fd39e40317' 
  AND token = 'ihHwiuxwphg7cD8K4xeMPQsRNONm5+Go6egVAQZuY3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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