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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32436411199299c89c47ecfec69a0a376ad4eb4ea32452e1b949ded7f72d2af1' 
  AND token = 'xvIIt33vgDAJPi0xI4qwCA+zL4B4Msd56CbpeKazlrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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