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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c799126503731a3dd92a673eb1ccd0c6335fde65b357c272e5ea9787994438' 
  AND token = 'TESUpA6PFgtyW1/bEMoGGg5CuBsVXGg4Hwuloh9Odug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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