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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '186c0ecb7a178a0c6226fa249548219514cb6efc055dbbc5411ff5d3ec516816' 
  AND token = 'X/tdlToGJMhzWPjWAYolWHZAuyJH50vd5EIqQrAA2G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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