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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d248a6c81497ea97aaace5c347869a5370600cbeaa13a39177899ec5632140' 
  AND token = '0kEy9sDkeZR9J4esf+TeVIY/u+cBQ63B4SbEyMalF/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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