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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad28af7b87f2d8e6546a5d41f54ef1f413d7814bf5835d461ded88f73f82eba7' 
  AND token = 'eKFNJXDef24qUXIfQc0ao43+ZN9Q4yAqYfBcaIshxHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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