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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb3b69125ce3e50935861f8c44668138c73413c4a2aaee83efbe44664373993' 
  AND token = 'V2pQF1YA4RERCImD6ayQNNmeRjL1mT8r4ZU6jq7cVeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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