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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056bd89a5c155fe83a875923ed6d5c95c68d90175357918b7f5cea6edc847dd2' 
  AND token = 'P9tUVwmmynX7tUf4I6vMyXO5g1YJJraDEMyD5GXmunw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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