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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238383d35d087f09045f9a01be8b28f857ff1ff6a8ad4fdb33aa5b4f653a3ae1' 
  AND token = 'npf+s2UMebhXD4upIF5xtQ+CyacQFf78uTv7cI9ExT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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