SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f079201d2bbf4376fbd320a1dee046f7257ddc695dd0afd91646318a6967b19c' 
  AND token = '2N+nOhy7S/auwCqwZZWP+xzcpW4HC+my/Jvof13dKoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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