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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0b6ce6f82d1e542dfb59eaaf2b417682b6ae4f83a385acadc77e87c0b0db39' 
  AND token = 'z5jo2gHO2r0ueL+YzRGmDBNU6hna9AdmfWDbOuw9Xc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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