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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b9923b7bde144012068993f50c1033a6c2ce920a3fb9a3b8ff0f240e857159' 
  AND token = 'NQm1OYq4cVLS8MUzikod4xPh1Qs+QPKEiuA6g3R3DVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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