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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a5f8ad2a155b5ae42ca2431dd1c088dbdbe565182f4890a2456d768632a79e' 
  AND token = '8jHSBuUrJhMptNI3TXVNjFaizd/9Y2KRW/an5m6sDPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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