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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0bd24fc64208d435cd2b277930a5cedaa0d211c6eccc45b72c8dbb744766a7' 
  AND token = '6HBtREQ8wFEusnLQxr9Ks1RQ+mu8yDMjD3KJHNKTb6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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