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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6cec443bff416097ec1f40b9a959b188b7816422d08e4d611183cc36ea84af' 
  AND token = 'FaED6Mc8tguwHrnx30mB0Hgm2B6rRkuvFRbPTkOAcBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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