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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836cf42e8ae949fe48f1dd365d525f708bc918c900a23041c86efe02f8614165' 
  AND token = 'yLRtsu/k+VDEl7FGXPXoBln3iP7E185jkYLGyCJs3fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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