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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38bef6cbc1b220627d9e5b63af9064b3215e9e0e680bd81869ca14eda90d6e57' 
  AND token = 'vKZodFr3Wj1LFlgOjSjT22SYRQCmOPu5uv0TqHm7Jnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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