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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a514c085088a8a1f7b0bf9027e10ab25fdb77aeeb8f748f9e3ee7c470763ed80' 
  AND token = '3Nnnaq01JVyi5JH9pSt2KRHZDsclNK+sWx/kXSlcXyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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