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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f31aabf37f3fddbf35a6c374cc66dbdfd57db40158a2c1dbac4080763b6563' 
  AND token = 'S70Ysmsau9MUYut0nrypD0RlEbvsLS9fvymq4K1gVeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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