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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cead4ca3416d223567ecaa5be5d33f710fd7185e3ae25a5623f961b52f4eb3f9' 
  AND token = 'Eg3iKxiMYg1KqXul0f7Ifrt7F/sWJB6LPtgWfo5W3CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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