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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a8a0f848cfee4598f95cfdca497e2ea8d16b76ba3679b3a7ded75aef60ead2' 
  AND token = 'cE1kpKgF7PM6m0LN0RzBQ2jt7c7PhIBh5HZ5ztIli9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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