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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3cae1b14a80e9ef6fc19bf427e3cc46c87629b00568aee5cc20394c4cbe225' 
  AND token = 'eT3zApm2gxnX9k5tUpWkfw9+S0txeDv1DuZj2MpAOF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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