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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7a4fd3754ca02123c80c22b21667d0730991ef7a0869afa898a36ff0c1b074' 
  AND token = '3sZeHOVawWg7tccRADQFUuNQYk8R1VMYMc4MkRMYun4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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