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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057b9a3d4e612b36a63ab9e494fca4d01df542aa999b2037f19e6d01f6bb1efa' 
  AND token = 'MGx8z6juCg/SLk/uZWiHRToF3Itwl1Z1NV5qM1WJCRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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