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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02bedfeda8ab24aef16e5b12b309b11aef6832f618db8778b6c4f91c127a4a2' 
  AND token = 'PVki7ZZO/c2iuZVdcbhBUyPbybQcULo1tWq0y4Q18nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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