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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235677b7b142fbc265c15a8e28f1bda8292026d3d53d3b2195d88d119aec5e39' 
  AND token = 'A2x5kc12frWBovbEpZHRgEeIOkJam/eBoeoHhJZM/IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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