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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9086b39dfe30db8a9bc7a420656e414fbd0505696a5ffe3557e5f07b989796' 
  AND token = '6MdKSGfKsimI4zE28tmC7XfeTAJvl2yyQ5S917psSyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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