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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402386b7d77d4652bb633f29f608348ecef178685b35a4256d6d93bb91e603fb' 
  AND token = 'kRNSPI87L8tVTSeqPAakBe0OSaZKKVnsjprWpxmKWWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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