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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a359012b59f38dfad598e67156a9e34951d572e58a6ff0d218907cdb6b1db2c9' 
  AND token = '9KeVH7dsZm+ZDxvnDiE55rTZ66J2TC+cuL1D6u/tyJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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