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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2dfcc9420c610513ac1f5c8c7e8fb5c901c50396e8b3d6feb0fa25e7992cf1' 
  AND token = 'h1PtZoqcia9/326MIIJMY85vZB7E3O4Iqeito2P56yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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