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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4ac2ba8c76a4c8c9e2b3a867253924973f69a33765e4ac8c09198a116e78c3' 
  AND token = 'kx3J1hU9+KxQtp87lUVeFdRtjSBBUZucAIgicJVcOio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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