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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '589825f8c007ebe3c86d0ac98dd0b2456d396f7caf0c4d6f1dba12c0b083ec99' 
  AND token = 'd8wIb8X/5Lk56lGJVd+FDcB7cu4Y3C+o67/AOE29MRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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