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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05869724ae6d1b52dff557aabe2d92db640220c69047ae155a7976486fa7c01f' 
  AND token = 'Si931QP8rCigqdSF8dEHpiFHODEFTGfO8u7xJ+aq/Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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