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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea31c40e290d0ca8a436e192fb5ea7d96e4ca406db84d3f6bd1343231c0e0b21' 
  AND token = 'TggmMb5k9crQXBkizXpkMeu+MNjLNuhLDEprx9xF1R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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