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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faed11ac3dff017845783b2ac9eddfd171b307c66a82a7b1ae4cfd5b00ff6c64' 
  AND token = 'yoXw/Ujr0N49i5Kr8btf3PiNTKtJf6X1gHmSYEy+F1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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